diff --git a/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php b/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
index c393b2e..06771ab 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
@@ -801,7 +801,7 @@ function document_self_tokens(&$tokens) {
     }
   }
 
-  function add_self_tokens(&$tokens, $item) {
+  protected function addSelfTokens(&$tokens, $item) {
     $field = $this->field_info;
     foreach ($field['columns'] as $id => $column) {
       // Use filter_xss_admin because it's user data and we can't be sure it is safe.
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php
index 44faa7f..28d2b98 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php
@@ -141,7 +141,7 @@ function document_self_tokens(&$tokens) {
     $tokens['[' . $this->options['id'] . '-vocabulary' . ']'] = t('The name for the vocabulary the term belongs to.');
   }
 
-  function add_self_tokens(&$tokens, $item) {
+  protected function addSelfTokens(&$tokens, $item) {
     foreach (array('tid', 'name', 'vocabulary_vid', 'vocabulary') as $token) {
       // Replace _ with - for the vocabulary vid.
       $tokens['[' . $this->options['id'] . '-' . str_replace('_', '-', $token) . ']'] = isset($item[$token]) ? $item[$token] : '';
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
index 7aa22fe..a14f625 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
@@ -80,7 +80,7 @@ function document_self_tokens(&$tokens) {
     $tokens['[' . $this->options['id'] . '-rid' . ']'] = t('The role ID of the role.');
   }
 
-  function add_self_tokens(&$tokens, $item) {
+  protected function addSelfTokens(&$tokens, $item) {
     $tokens['[' . $this->options['id'] . '-role' . ']'] = $item['role'];
     $tokens['[' . $this->options['id'] . '-rid' . ']'] = $item['rid'];
   }
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
index 64480b5..4fa6811 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
@@ -76,7 +76,7 @@ function document_self_tokens(&$tokens) {
     $tokens['[' . $this->options['id'] . '-rid' . ']'] = t('The role machine-name of the role.');
   }
 
-  function add_self_tokens(&$tokens, $item) {
+  protected function addSelfTokens(&$tokens, $item) {
     if (!empty($item['role'])) {
       $tokens['[' . $this->options['id'] . '-role' . ']'] = $item['role'];
       $tokens['[' . $this->options['id'] . '-rid' . ']'] = $item['rid'];
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php
index bc8dfff..effe7da 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php
@@ -1497,7 +1497,7 @@ function get_render_tokens($item) {
     $this->view->style_plugin->render_tokens[$this->view->row_index] = $tokens;
     $this->last_tokens = $tokens;
     if (!empty($item)) {
-      $this->add_self_tokens($tokens, $item);
+      $this->addSelfTokens($tokens, $item);
     }
 
     return $tokens;
@@ -1572,12 +1572,12 @@ function get_token_values_recursive(array $array, array $parent_keys = array())
    * where token is the field ID and subtoken is the field. If the
    * field ID is terms, then the tokens might be [terms-tid] and [terms-name].
    */
-  function add_self_tokens(&$tokens, $item) { }
+  protected function addSelfTokens(&$tokens, $item) { }
 
   /**
    * Document any special tokens this field might use for itself.
    *
-   * @see add_self_tokens()
+   * @see addSelfTokens()
    */
   function document_self_tokens(&$tokens) { }
 
diff --git a/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/field/FieldTest.php b/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/field/FieldTest.php
index 14f856e..9108376 100644
--- a/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/field/FieldTest.php
+++ b/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/field/FieldTest.php
@@ -43,9 +43,9 @@ public function getTestValue() {
   }
 
   /**
-   * Overrides Drupal\views\Plugin\views\field\FieldPluginBase::add_self_tokens().
+   * Overrides Drupal\views\Plugin\views\field\FieldPluginBase::addSelfTokens().
    */
-  function add_self_tokens(&$tokens, $item) {
+  protected function addSelfTokens(&$tokens, $item) {
     $tokens['[test-token]'] = $this->getTestValue();
   }